Since today I think all the lines in the fractions in LaTeX equations aren't visible anymore on Windows desktop version.
Probably the same as Katex Fraction Lines are missing in 1.4.19 · Issue #4194 · laurent22/joplin · GitHub
Yes it seems like it. Like is mentioned over there, for some zooming levels the lines appear. Unfortunately the lines only appear in when zooming too far out or in. The preferable zooming levels don't show the line.
So I would say to re-open that bug report?
It is open.
This is an upstream issue, in fact it's a combination of issues in chromium and katex. So unless these issues are fixed upsteam, there's nothing we can do in Joplin.
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